An estimation of about 600 subs were operated during the war.
World War I submarines were primarily used to locate and attack surface cargo and warships.
Yes, many submarines were used in WW1 by most of the major combatants.
During World War 2, it is reported that over 2,000 variants of Japanese Submarines were used during World War 2. Out of this, it is estimated that 10,000s were likely to be used during WW2.
submarines were used in WW1 and the weapons used were torpedos and a deck gun.
They were used extensively throughout the war - from beginning to end.
They were used by submarines to navigate when not in open waters, They were also used by submarines and anti-submarine ships to locate enemy submarines.
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World War 1
2,200,000 Soldiers 97 Warships 40 Submarines.
Britain, France, Germany, Italy and USA all used submarines during WW1
They were used in the first world war in submarines. The are used now also for submarines and also war tanks. The outer coating of the periscope for the submarines were firm and waterproof for protection from the water pressure. As for the war tank the periscope is able to turn 360 degrees.
Why don't you just Google "World War 1 Submarines?"